Measuring apparatus

Claim 1

A MEASURING APPARATUS COMPRISING: A FIRST PLURALITY OF DIVISION ELEMENTS OF HIGH-PERMEABILITY MAGNETIC MATERIAL, HAVING UNIFORM FIELD-ALTERING PROPERTIES AND UNIFORM DIMENSIONS; A SECOND PLURALITY OF DIVISION ELEMENTS OF LOWPERMEABILITY MATERIAL, HAVING UNIFORM FIELD-ALTERING PROPERTIES AND UNIFORM DIMENSIONS; MEANS FOR MOUNTING SAID DIVISION ELEMENTS IN A RIGID ASSEMBLY IN FIXED LONGITUDINAL ALIGNMENT WITH EACH OTHER AND IN ABUTTING RELATION TO EACH OTHER, THE DIVISION ELEMENTS FROM SAID FIRST AND SECOND PLURALITIES BEING DISPOSED IN ALTERNATION IN SAID ASSEMBLY, THE TOTAL EFFECTIVE LENGTH OF THE ASSEMBLY BEING THE SUM OF THE LENGTHS OF SAID DIVISION ELEMENTS; TWO SENSING TRANSFORMERS, EACH INCLUDING A PRIMARY WINDING AND A SECONDARY WINDING, MOUNTED IN A SENSING ASSEMBLY IN FIXED SPACED RELATION TO EACH OTHER AND EACH DISPOSED IN SPACED ENCOMPASSING RELATION TO SAID DIVISION ELEMENT ASSEMBLY, SAID SENSING ASSEMBLY BEING LONGITUDINALLY MOVABLE ALONG SAID DIVISION ELEMENT ASSEMBLY; SAID SENSING TRANSFORMERS EACH HAVING A TOTAL EFFECTIVE LENGTH SIMILAR TO THE LENGTH OF THE SHORTER ONES OF SAID INDIVIDUAL DIVISION ELEMENTS, SAID DIVISION ELEMENTS EACH ALTERING THE MAGNETIC FIELDS ADJACENT SAID SENSING TRANSFORMERS TO VARY THE AMPLITUDE OF ELECTRICAL SIGNALS, INDUCED IN SAID SECONDARY WINDINGS OF SAID SENSING TRANSFORMERS; AND CIRCUIT MEANS CONNECTED TO SAID SECONDARY WINDINGS OF SAID SENSING TRANSFORMERS FOR DERIVING A CONTROL SIGNAL INDICATIVE OF THE POSITION OF SAID SENSING ASSEMBLY ALONG SAID DIVISION ELEMENT ASSEMBLY.